package com.example.imtoken.core.utils;

import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;

import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
import com.bumptech.glide.load.resource.bitmap.BitmapTransformation;
import com.bumptech.glide.util.Util;

import java.nio.ByteBuffer;
import java.security.MessageDigest;

/**
 * glide设置圆形图片
 * 不需要去添加圆形图片控件
 * Glide.transform(new GlideCircleTransform(mContext))
 * 也可按照自己的要求修改
 * 解决图片闪烁问题
 */
public class GlideCircleTransform extends BitmapTransformation {
    public GlideCircleTransform() {
        super();
    }

    private static float radius;
    private final String ID = "com.bumptech.glide.transformations.FillSpace";
    private final byte[] ID_ByTES = ID.getBytes(CHARSET);

    @Override
    public Bitmap transform(BitmapPool pool, Bitmap toTransform,
                            int outWidth, int outHeight) {
        return circleCrop(pool, toTransform);
    }

    private static Bitmap circleCrop(BitmapPool pool, Bitmap source) {
        if (source == null) return null;
        int size = Math.min(source.getWidth(), source.getHeight());
        int x = (source.getWidth() - size) / 2;
        int y = (source.getHeight() - size) / 2;
        Bitmap squared = Bitmap.createBitmap(source, x, y, size, size);
        Bitmap result = pool.get(size, size, Bitmap.Config.ARGB_8888);
        if (result == null) {
            result = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
        }
        Canvas canvas = new Canvas(result);
        Paint paint = new Paint();
        paint.setShader(new BitmapShader(squared, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
        paint.setAntiAlias(true);
        float r = size / 2f;
        radius = r;
        canvas.drawCircle(r, r, r, paint);
        return result;
    }

    @Override
    public boolean equals(Object o) {
        if (o instanceof GlideCircleTransform) {
            GlideCircleTransform other = (GlideCircleTransform) o;
            return radius == other.radius;
        }
        return false;
    }

    @Override
    public int hashCode() {
        return Util.hashCode(ID.hashCode(),
                Util.hashCode(radius));
    }

    @Override
    public void updateDiskCacheKey(MessageDigest messageDigest) {
        messageDigest.update(ID_ByTES);
        byte[] radiusData = ByteBuffer.allocate(4).putInt((int) radius).array();
        messageDigest.update(radiusData);
    }
}
